[runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index f0ead54a962725e615c08e3dfc622b41b6041054..9bdb7bf39434e51d8d704b473e03f051c734a62d 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -3253,13 +3253,15 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
     __ Branch(&done, ne, result, Operand(scratch));
     if (info()->IsStub()) {
       // A stub can safely convert the hole to undefined only if the array
-      // protector cell contains (Smi) Isolate::kArrayProtectorValid. Otherwise
+      // protector cell contains (Smi) Isolate::kArrayElementsProtectorValid.
+      // Otherwise
       // it needs to bail out.
-      __ LoadRoot(result, Heap::kArrayProtectorRootIndex);
+      __ LoadRoot(result, Heap::kArrayElementsProtectorRootIndex);
       // The comparison only needs LS bits of value, which is a smi.
       __ ld(result, FieldMemOperand(result, Cell::kValueOffset));
-      DeoptimizeIf(ne, instr, Deoptimizer::kHole, result,
-                   Operand(Smi::FromInt(Isolate::kArrayProtectorValid)));
+      DeoptimizeIf(
+          ne, instr, Deoptimizer::kHole, result,
+          Operand(Smi::FromInt(Isolate::kArrayElementsProtectorValid)));
     }
     __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
     __ bind(&done);